3.
Route the leads to the high-volt age feedthroughs and cut them to length. Route each lead to the near -
est feedthrough, with out cross ing them and with no sharp bends. The leads must NOT touch the
source tray or any other grounded com po nent or struc ture.
4.
At tach the sup plied ter mi nals to the ends of the leads and con nect the ter mi nals to the HV
feedthroughs.
5.
If you have not al ready done so, con nect the at mo sphere-side high-volt age ca bles to the ter mi nals on
the lower ends of the high-volt age feedthroughs and to sec ond ary side of the gun fil a ment trans -
former. Be care ful in rout ing these ca bles. They should be loose, rather than taut, with no sharp
bends, and they should not run over any sharp edges or close to any heat-gen er at ing com po nents.
Make sure that these ca bles are se curely clamped near their ends to ad ja cent struc tures. On the
feedthrough end, the ca bles are gen er ally se cured to the feedthrough it self. On the trans former end,
the ca ble can be se cured to a frame mem ber or to some other ad ja cent struc ture.
DANGER
The exposed ends of the high-voltage cables present a severe, even
lethal, hazard. This hazard is much more serious if the cables are not
properly secured near their ends.
Pro ce dure 8: In stall Op tional Equip ment
1.
If your source tray is not fit ted with full de bris shields, in stall a shield that will cover the in-vac uum
high volt age leads and as much of the emit ter as sem bly’s fil a ment bus bars as pos si ble (see Fig ure
2-2). This shield should be made of type-304 stain less steel, and it should be placed so that no part of
it is closer than 1/4" to ei ther of the high-volt age feedthroughs. There should be no grounded com po -
nents within the shielded area.
2.
In stall a de po si tion shut ter and sup port ing hard ware, if such is re quired for your ap pli ca tion. The
shut ter must be at least 1.5" above the top of the cru ci ble.
3.
In stall sec ond ary elec tron shield ing. at least 5" (127 mm) high should be in stalled at the rear of the
gun.
Pro ce dure 9: In stall In ter locks
Con nect all pro tec tive in ter locks. The min i mum re quired in ter lock ing in cludes the fol low ing:
•
a cham ber pres sure in ter lock that pre vents the fil a ment cur rent and the high-volt age from be ing on
when the pres sure is higher than 5
×
10
-4
torr
•
a wa ter pres sure in ter lock that pre vents the fil a ment cur rent and the high-volt age from be ing on when
the wa ter pres sure is lower than 3.0 gpm
•
an in ter lock that pre vents the fil a ment cur rent and the high-volt age from be ing on if the vac uum cham -
ber door or the door(s) on the vac uum cu bi cle are open.
Pro ce dure 10: Con nect the Source Tray to a Low-Im ped ance Ground
The source op er ates at ex tremely high volt age with re spect to earth ground. It can there fore place un grounded
el e ments at dan ger ous po ten tial. This po ten tial var ies di rectly with the cou pling be tween the source, the com -
po nents, and the im ped ance to ground. Make sure the earth ground to the build ing (and hence to the sys tem) is
at zero re sis tance. The build ing’s wa ter pipes will gen er ally not pro vide proper earth ground. Fig ure 2-4
shows the two ap proved meth ods for set ting up a low-im ped ance ground.
Installation
STIH-270-2PT
0101-9004-0A
2-13
Содержание Temescal SuperSource2 STIH-270-2PT
Страница 54: ...Operation 3 18 0101 9004 0A STIH 270 2PT...
